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Here are 6 tips to know before you book your flight during the COVID-19 pandemic. USA TODAY

What determines an airplane’s altitude? is it relative to sea level or the land over which it is flying? For instance, when I am flying over Denver, Colorado, does the official altitude at which I am flying decrease by 5,280 feet?

– Mark, Colorado

Most airplanes fly above Mean Sea Level altitudes (MSL), the altimeter would read 5,280 feet in Denver. They are corrected for barometric pressure. There are radio altimeters that the altitude Above Ground Level (AGL), which are used for low visibility approaches.

When flying above 18,000 feet in the U.S., airplanes express altitude

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